Plant club moss in a shady garden bed that receives less than two hours of direct sunlight per day. Amend the soil with 3 inches peat moss, 2 inches leaf mold and 1 inch of coarse horticultural sand; till the amendments into the top 6 inches of soil. Plant club moss at the same depth it grew in its nursery container.
Water the club moss regularly during the spring and summer months during weeks in which it gets little or no natural moisture. Provide up to 1 inch of supplemental irrigation each week; maintain soil that's moist, but not flooded.
Fertilize club moss with a quarter-strength solution of a balanced, water-soluble fertilizer once per month in the spring and summer. Apply the fertilizer product carefully and according to label instructions.